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I cannot grasp 2 and 4 at the moment. That's what is driving me nuts and here I am.

Someone smarter than me, please have a look!

I cannot grasp 2 and 4 at the moment.

let mut new_pos = Point2::new(curr_pos.x + x_offset, curr_pos.y);

let collision_on_x = collide_with_world(&new_pos, &world);

if !collision_on_x  {
    transform.translate_x(x_offset);
}

new_pos.y = curr_pos.y + y_offset;

let collision_on_y = collide_with_world(&new_pos, &arena);

if !collision_on_y  {
    transform.translate_y(y_offset);
}

fn collide_with_world(new_pos: &Point2<f32>, world: &World) -> bool {
    // TODO make these sizes i16 instead so we can grow in any direction!
    let mut left_tile: u16 = (new_pos.x / arena::TILE_SIZE_IN_PIXELS as f32) as u16;
    // -1 so that we do not collide until we are exactly at the thing
    let mut right_tile: u16 = ((new_pos.x + PLAYER_WIDTH - 1.0) / arena::TILE_SIZE_IN_PIXELS as f32) as u16;
    let mut top_tile: u16 = ((new_pos.y + PLAYER_HEIGHT - 1.0) / arena::TILE_SIZE_IN_PIXELS as f32) as u16;
    let mut bottom_tile: u16 = (new_pos.y / arena::TILE_SIZE_IN_PIXELS as f32) as u16;

    println!("new_pos: {:?}, left {}, right {}, top {}, bottom {}", (new_pos.x, new_pos.y), left_tile, right_tile, top_tile, bottom_tile);

    // Useless as long as we use unsigned coordinates
    //if left_tile < 0 {
    //    left_tile = 0;
    //}

    if right_tile > arena::ARENA_WIDTH_IN_TILES {
        right_tile = arena::ARENA_WIDTH_IN_TILES;
    }

    // Useless as long as we use unsigned coordinates
    //if bottom_tile < 0 {
    //    bottom_tile = 0;
    //}

    if top_tile > arena::ARENA_HEIGHT_IN_TILES {
        top_tile = arena::ARENA_HEIGHT_IN_TILES;
    }

    let mut any_collision = false;

    for i in left_tile..=right_tile {
        for j in bottom_tile..=top_tile {
            let tile = arena.get_tile(i, j);
            println!("tile at {:?} is {:?}", (i, j), tile);

            match tile {
                Some(tile) => {
                    if tile == WALL {
                        println!("hit a wall at {:?}!", (i, j));
                        any_collision = true;
                    }
                }
                None => (),
            }
        }
    }

    return any_collision;
}

let mut new_pos = Point2::new(curr_pos.x + x_offset, curr_pos.y);

let collision_on_x = collide_with_world(&new_pos, &world);

if !collision_on_x  {
    transform.translate_x(x_offset);
}

new_pos.y = curr_pos.y + y_offset;

let collision_on_y = collide_with_world(&new_pos, &world);

if !collision_on_y  {
    transform.translate_y(y_offset);
}

fn collide_with_world(new_pos: &Point2<f32>, world: &World) -> bool {
    // TODO make these sizes i16 instead so we can grow in any direction!
    let mut left_tile: u16 = (new_pos.x / TILE_SIZE_IN_PIXELS as f32) as u16;
    // -1 so that we do not collide until we are exactly at the thing
    let mut right_tile: u16 = ((new_pos.x + PLAYER_WIDTH - 1.0) / TILE_SIZE_IN_PIXELS as f32) as u16;
    let mut top_tile: u16 = ((new_pos.y + PLAYER_HEIGHT - 1.0) / TILE_SIZE_IN_PIXELS as f32) as u16;
    let mut bottom_tile: u16 = (new_pos.y / TILE_SIZE_IN_PIXELS as f32) as u16;

    println!("new_pos: {:?}, left {}, right {}, top {}, bottom {}", (new_pos.x, new_pos.y), left_tile, right_tile, top_tile, bottom_tile);

    // Useless as long as we use unsigned coordinates
    //if left_tile < 0 {
    //    left_tile = 0;
    //}

    if right_tile > WORLD_WIDTH_IN_TILES {
        right_tile = WORLD_WIDTH_IN_TILES;
    }

    // Useless as long as we use unsigned coordinates
    //if bottom_tile < 0 {
    //    bottom_tile = 0;
    //}

    if top_tile > WORLD_HEIGHT_IN_TILES {
        top_tile = WORLD_HEIGHT_IN_TILES;
    }

    let mut any_collision = false;

    for i in left_tile..=right_tile {
        for j in bottom_tile..=top_tile {
            let tile = world.get_tile(i, j);
            println!("tile at {:?} is {:?}", (i, j), tile);

            match tile {
                Some(tile) => {
                    if tile == WALL {
                        println!("hit a wall at {:?}!", (i, j));
                        any_collision = true;
                    }
                }
                None => (),
            }
        }
    }

    return any_collision;
}